Update us.m3u

Added link from https://github.com/iptv-org/iptv/issues/1949#issuecomment-813273511

channels/us.m3u

@@ -3388,3 +3388,5 @@ https://glxlmn026c.singularcdn.net.br/playout_04/playlist-720p.m3u8
 https://glxlmn026c.singularcdn.net.br/playout_05/playlist-720p.m3u8
 #EXTINF:-1 tvg-country="GR",Fox Greece
 http://live.streams.ovh:1935/foxtv/foxtv/playlist.m3u8
+#EXTINF:-1 tvg-logo="http://image.tving.com/upload/cms/caic/CAIC1900/C43241.png" tvg-country="KR",Nickelodeon Korea
+http://121.130.84.30:9999/klive/api/url.m3u8?m=url&s=tving&i=C43241&q=SD&apikey=cit1254678